CHARACTERIZATION (CERTIFICATION) OF CORN BRAN (NIST-RM-8433), CORN STARCH (NIST-RM-8432) AND MICROCRYSTALLINE CELLULOSE (NIST-RM-8416) REFERENCE MATERIALS FOR ESSENTIAL AND TOXIC MAJOR, MINOR AND TRACE ELEMENTAL CONSTITUENTS

Corn Bran (NIST RM 8433), Corn Starch (NIST RM 8432) and Microcrystall ine Cellulose (NIST RM 8416) Reference Materials were characterized fo r essential and toxic major, minor and trace elemental composition in an interlaboratory cooperative characterization campaign. Extensive ap plication of widely varied analytical methods by analysts in cooperati ng laboratories yielded 10 - 29 best estimate and 1 - 16 informational concentration values for each of these materials. Two materials, Corn Starch and Microcrystalline Cellulose, contain particularly low level s of trace elements. These reference materials are intended for analyt ical quality control of elemental determinations in corn and plant pro ducts as well as other agricultural/food materials with related matric es.